The Pelvis

Question 1

The pelvis is made up of 4 bones, name them

Answer 1

2x Innominate bones
1x Sacrum
1x Coccyx

Question 2

The Innominate bone is formed by the fusion of which 3 bones?

Answer 2

Ilium
Ischium
Pubis

Question 3

How many fused vertebrae does the sacrum consist of?

Answer 3

5

Question 4

How many fused vertebrae does the coccyx consist of?

Answer 4

4

Question 5

The pelvis is divided into which 3 areas

Answer 5

• Brim
• Cavity
• Outlet

Question 6

Name at least 2 functions of the pelvis

Answer 6

• Supports/ protects the position of the female organs
• Facilitates the birth of a fetus
• Supports the spinal column

Question 7

What are the 3 diameters of the brim?

Answer 7

Anterior-posterior diameter- 11cm
Oblique diameter- 12cm
Transverse diameter- 13cm

Question 8

What are the diameters of the pelvic outlet?

Answer 8

Anterior posterior - 13cm
Oblique - 12cm
Transverse - 11cm

Question 9

The pelvic brim has 8 different parts (clockwise.) Name them..

Answer 9

1. Promontory of sacrum
2. Ala of sacrum
3. Sacroiliac joint
4. Iliopectineal line
5. Iliopectineal eminence
6. Superior pubic ramus
7. Bone of pubic body
8. Symphysis pubis

Question 10

What are the functions of the pelvis?

Answer 10

• Supports the spinal column and the weight of the body
• To allow a fetus to pass through
• Contains and protects the reproductive organs, bladder and rectum
• There so muscles can attach

Question 11

What is the true female pelvis called?

Answer 11

Gynaecoid

Question 12

What are the main features of the Gynaecoid pelvis?

Answer 12

• Rounded brim
• Generous fore
• Straight side walls
• Shallow cavity with a broad, well curved sacrum
• Blunt ischial spines
• Pubic arch of 90 degrees

Question 13

What happens to the 3 parts of the innominate bone around the ages of 20-25?

Answer 13

They all fuse together into one large bone

Question 14

Where does the sacrum lie between?

Answer 14

The 2 Illia in order to form the back of the pelvis

Question 15

What is the name of the lowest part of the spine?

Answer 15

The Coccyx

Question 16

What does the coccyx do during labour?

Answer 16

Moves backwards in order to enlarge the pelvic outlet, this allows more room for the fetus to pass through

Question 17

Why is the android pelvis named what it is?

Answer 17

It resembles the male pelvis.

Question 18

Where is the sacroiliac joint found?

Answer 18

In the bony pelvis - between the sacrum and ilium of the pelvis

Question 19

Where can the sacrum be found?

Answer 19

At the bottom of the spine, above the coccyx

Question 20

Name 3 points regarding the iliac crest

Answer 20

1. Located on the superior and lateral edge of the ilium
2. Close to the surface of the skin
3. It is the largest of the 3 bones that merge to form the hip bone

Question 21

The iliac crest is the top part of which bone?

Answer 21

The ilium

Question 22

Name 3 factors regarding the ilium

Answer 22

• A wide, flat bone that provides attachment points for muscles of the trunk and hip
• Located lateral to the sacrum
• Forms the sacroiliac joint with the sacrum
• Ilium forms separately from other hip bones during fetal development

Question 23

What is the function of the coccyx bone?

Answer 23

It’s function is to anchor several muscles of the bones that bear the body’s weight while sitting

Question 24

What are the diameters of the pelvic cavity?

Answer 24

All 12cm

Question 25

What does the pelvic cavity help to form?

Answer 25

Curve of Carus

Question 26

The pelvic outlet has 5 different parts, what are they?

Answer 26

Symphysis pubis
Pubic arch
Ischial spines
Tip of the coccyx